Cargo Features

[dependencies]
adns-server = { version = "0.1.1", default-features = false, features = ["file_zone"] }
default = file_zone

The file_zone feature is set by default whenever adns-server is added without default-features = false somewhere in the dependency tree.

file_zone default = really-notify

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

really-notify file_zone